I have a Terrain and Cube. Terrain has terrain collider attached and cube has box collider on it. But still cube is falling through the terrain. I tried lot of things explained in other questions and on other forums but none of them has fixed the issue. Screenshot of both cube and terrain setting is attached below.
you need to add a rigid body to the cude AND make sure that this rigid body has the property of "is Trigger" not enabled, if u needed enabled u need to wrap the whole cube inside empty object and make it enabled in the new wrapper and disabled in the cube, this will solve the probelm